Had a weird issue show up that I can't figure out. Bought juice a week ago, started to taste burnt yesterday after no problems for the week. I replaced the coil, no dice. Replaced the coil the second time, no help. Flushed fluid twice, washed the whole thing.....no improvement. Does the same thing on either of my boxes. If I cover the hole and blow into it, it tastes OK for a few hits then returns to a burnt taste. I have no idea what's going on here....any thoughts?